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Diablo 4 Item Upgrades The upgrade of an item lets players increase the level of their equipped items like trinkets, weapons, and armor over a certain threshold. They can be done at any item upgrader NPC with the appropriate currency. Upgrade components are inserted into equipment to offer attribute bonuses and extra effects. These are usually slot-restricted however, there are some universal upgrades. Rerolling In Diablo 4, a player can roll back an upgrade for an item. This is accomplished